Poach egg (see below). Toast bread; place on serving plate. Place slice of prosciutto on bread. Place poached egg on prosciutto. Top with bruschetta mixture and cheese.
Basic Method to Poach Egg: Bring 3 inches (7.5 cm) of water to boil in medium saucepan. Reduce to gentle simmer. Break egg into small dish. Gently slip egg into water. Cook to desired doneness in barely simmering water for 3 to 5 minutes. Remove with slotted spoon and drain on paper towel.